How could we prove that triangleoeb is congruent to triangleoea

Create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8